[asterisk-dev] [Code Review] 4474: core: Add basic DNS API implementation

[rmudgett]

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/trunk/include/asterisk/dns_recurring.h
<https://reviewboard.asterisk.org/r/4474/#comment25194>

    Since DNS resolution can take time, should the next refresh interval be set in advance of the lowest returned TTL so the refresh happens before a record's expiry?
    
    Would it be advisable for the resolver to supply some kind of refresh before TTL expiry?  Or add a refresh at xx% of lowest TTL or one second whichever is greater parameter?  Maybe a maximum refresh interval time if the TTL is very large.


- rmudgett


On March 11, 2015, 6:42 a.m., Joshua Colp wrote:
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> https://reviewboard.asterisk.org/r/4474/
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> (Updated March 11, 2015, 6:42 a.m.)
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> Review request for Asterisk Developers.
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> Bugs: ASTERISK-24834
>     https://issues.asterisk.org/jira/browse/ASTERISK-24834
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> Repository: Asterisk
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> Description
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> This change implements the basic API as described on the DNS API wiki page. Minimal changes have been made as required based on real usage and getting a feel for it. As it is the core functionality is present. Resolvers can register, queries can be made (async / sync).
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> As the API was basically copy/pasted from the wiki page there still remain stubs to be filled in for higher level functionality (such as parsing and query sets).
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> Diffs
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>   /trunk/main/dns_query_set.c PRE-CREATION 
>   /trunk/main/dns_core.c PRE-CREATION 
>   /trunk/include/asterisk/dns_tlsa.h PRE-CREATION 
>   /trunk/include/asterisk/dns_srv.h PRE-CREATION 
>   /trunk/include/asterisk/dns_resolver.h PRE-CREATION 
>   /trunk/include/asterisk/dns_recurring.h PRE-CREATION 
>   /trunk/include/asterisk/dns_query_set.h PRE-CREATION 
>   /trunk/include/asterisk/dns_naptr.h PRE-CREATION 
>   /trunk/include/asterisk/dns_internal.h PRE-CREATION 
>   /trunk/include/asterisk/dns_core.h PRE-CREATION 
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> Diff: https://reviewboard.asterisk.org/r/4474/diff/
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> Testing
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> Ran DNS unit tests as done by Mark, they are happy.
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> Thanks,
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> Joshua Colp
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